Machine for extracting threads from woven fabrics



Nov. 8, 1932. E. PRAZAK 1,8865% MACHINE FOR EXTRACTING THREADS FROM WOVEN FABRICS Filed April 2, 1951 2 sneets sneet l g} lNVENTQR ATTORNEYS E. PRAZAK Nov. 8, 1932.

MACHINE FOR EXTRACTING THREADS FROM WOVEN FABRICS Filed April 2, 1951 2 Sheets-Sheet 2 :1 m A" m n u 0 n W m 3 w J n M Q m 1 YUM" u m m m w W u m JHIJO m WMIIW A V @V ATTORNEYS longitudinal Patented Nov. 8, 1932 UNITED STATES EMIL PRAZAK, OF ELIZABETH, NEW JERSEY MACHINE FOR EXTRACTING TI-IBEAES FROM W OVEN FABRICS Application filed April 2, 1931.

The object of this invention is to provide certain improvements in the construction, form and arrangement of different parts of a machine for extracting threads from woven fabrics whereby the deflected threads may be cut off very close to the body of the fabric, thus leaving very short ends which will allow the threads to be separated much more easily and will obviate the tendency of the transverse threads to break when the longitudinal threads are being deflected by the thread deflector blade; the thickness of this blade serving to separate the transverse threads so that there is no friction between them and the 7 threads when they are deflected into postion to be cut off.

A practical embodiment of my invention is represented in the accompanying drawings in which only so much of a machine of the above character is illustrated as will give a clear understanding of my improvements.

Fig. 1 represents the machine in front elevation with certain of the parts broken away to more clearly illustrate the parts behind the same.

Fig. 2 represents the machine in end elevation with the cover plate for the head removed.

Fig. 3 represents a detail vertical longitudinal section on an enlarged scale, taken in the plane of the line TE -TH of Fig. 4, looking in the direction of the arrows, the feed plate and its operating mechanism being removed.

Fig. 4 represents a detail horizontal section taken in the plane of the line IVIV of Fig. 8, looking in the direction of the arrows.

Fig. 5 represents an inverted plan view of the parts represented in Fig. 4, the feed plate and its operating mechanism being removed.

6 represents a detail transverse ver-' tical section taken in the planes of the line VlVI of Fig. 5, looking in the direction of the arrows, the feed plate being shown in cross section in this figure. I

Fig. 7 represents a detail face view on an enlarged scale of the blade of the deflector represented in certain of the previous figures;

Serial No. 527,321.

to more clearly illustrate the thread deflecting prongs along the edges of the blade.

The machine table 1, upright 2, overhang ing arm 3, head 4, upper horizontally disposed rotary shaft 5, needle bar 6, presser bar 5 7, divided presser foot 8, feed plate 9 and its operating mechanism may all be of well rnown or approved form and will not be specifically described herein.

Hy improved thread extracting and cutting mechanism constructed, arranged and operated as follows:

The lower horizontally disposed cutter shaft 10 is mounted beneath the table 1 and an oscillating movement of the desired length may be imparted to the shaft by providing the shaft with a crank 11 connected by a pitma-n rod 12 to an eccentric cam 13 on the upper horizontally disposed rotary shaft 5. The cutter plate 14 maybe removably secured on the table 1 by screws 15, which cutter plate has a longitudinal slot 16 therethrough, from the rear end of which slot there extends a deep longitudinal groove 17 in the under face of the cutter plate, leaving a thin forwardly projecting portion '18 of the plate having a squared edge which forms the rear end of the slot 16. This cutter plate 14 also has in its top surfacea shallow longitudinal groove 19 which is wider than the slot 16, in which groove there is removably seated a horizontally disposed fixed cutter blade 20, the front beveled cutting edge of which forms together with the squared rear edge of the-slot 16 a transverse opening for receiving the prongged blade 21 of the vertically reciprocating thread deflector, the shank 22 of which is removably attached to the needle bar 6.

The fixed cutter blade 20 is adjustable lon-o gitudinally in the shallow top groove 19 and is secured in its desired adjustment by providing the blade with a longitudinal slot 23 therethrough and providing a clamping screw 24, the shank of which passes through the slot 23 into threaded engagement with the cutter plate 14.

A horizontally disposed reciprocating cutter blade 25 is positioned to coact with the fixed cutter blade 20 to cut and remove the deflected threads, which reciprocating cutter blade is removably mounted on a carriage 26 between the top of the carriage and the under side of the thin forwardly projecting portion 18 of the cutter plate. This reciproeating cutter blade is longitudinally adjustable on the carriage and secured in its desired adjustment by providing the blade with a longitudinal slot 27 therethrough and providing a clamping screw 28, the shank of which passes through the slot 27 into thread ed engagement with the carriage. The head of this clamping screw reciprocates in a longitudinal slot 29 through the cutter plate 14 to the rear of the slot 16.

This reciprocating cutter blade 25 is provided with a beveled diagonal cutting edge for coaction with the cutting edge of the fixed cutter plate and it is also provided with a forwardly projecting prong'30 at one side of the blade, which prong engages the under side of the fixed cutter blade 20 at all times, to ensure the proper coaction of the cutting edges of the two blades. 7

The upper portion of the carriage 26 is located in the groove 17 and is guided in its forward and rearward movements by the parallel side walls of thesaid groove. rige is slidably held in this position with an upward pressure on the carriage and thereby on the movable cutter. blade 25 to cause the blade to press against the bottom of the groove 17' and the under side of the fixed cutter blade 20 when brought into'coacti'on therewith, to ensure a shearing action on the de flected threads. The means which I have shown for accomplishing this upward pressure on the carriage and reciprocating cutter blade is as follows:

The opposite sides of the carriage below the cutter plate are provided with longitudinal grooves 31, 32, into which grooves are swung two upwardly pressing spring fingers 33, 34, pivoted on clamp screws 35, 36 respectively, to the under side of the cutter plate to the rear of the reciprocating carriage. These clamp screws 35, 36 when tightened serveto secure the spring fingers 33, 34 m their operative positions. The forward portions of these spring fingers when in their operative positions are located in shallow recesses 37,

38 in the bottom of the cutter plate along the opposite sides of the slot 16 and groove 17 whereby, as the carriage is moved forwardly, a progressively greater upward pressure is imparted thereto, to cause an effective shear-V ing coa'ction between the two cutter blades. These spring fingers maybe swung into and out of their operative positions when the cutter plate 14 is removed from the table 1.

j The operative connection between the oscillating cutter shaft 10 and reciprocating carriage 26 is as follows:

Theend of the oscillating cutter shaft which is beneath the carriage is provided The car-' with a crank pin 39 carried by two spaced .ears 40, 41 uprising from a sleeve 42 secured to the shaft. A vertically swinging hook 43 is pivoted on a cross pin 44 carried by two spaced ears 45, 46 which depend from the reciprocating carriage 26, which hook is arranged in position to operatively engage the crank pin 39 of the oscillating shaft 10. A coil spring 47 seated in the under side of the carriage serves the double purpose of a cush1on for the upward swinging movement of the hook 43 as it is lifted by the crank pin in its oscillating movement and of reventing the unintentional release of the hook 43 from the said crank pin.

It will be understood that the movements of the reciprocating cutter blade 25 with respect to the thread deflector are so timed that the prongs on the deflector blade 21 will force the required number of longitudinal threads downward through the transverse opening formed between the edgevof the fixed cutter blade-20 and the adjacent squared edge of the slot 16, and the deflector blade raised out of the way before the reciprocating cutter blade 3 25 is advanced by its oscillating cutter shaft 10 to cut off and remove the deflected threads. It will alsobe understood that the fabric is moved forward step by step in the usual manner between the combined thread defleeting and cutting operations.

It will also be understood that the number of prongs on the deflector blade 21 and also the width of the deflector blade may be varied to suit difierent requirements.

From the above description it will be seen that I have provided effective means whereby the deflected'threads may be cut off very close to the body of the fabric, thus ensuring a more even and effective removal of the threads from the fabric as Well as eliminating the tendency of the fabric to distort as the threads are deflected.

It will also be seen that avery effective shearing action between the cutter blades is ensured because of the constant upward pressure exerted upon the reciprocating cutter blade which causes it to have a snug sliding contact with the fixed cutter blade.

It will also be seen that, the several parts of the cutting mechanism may be very rapidly and easily assembled, disassembled and removed without disturbing the remaining parts of the machine.

It is evident that various changes may be resorted to in the construction, form and arrangement of the several parts without departing from the spirit and scope of my invention, and hence I do not intend to be limited to the particular embodiment herein shown and described, but i WVhat I claim is:

1. In a machine of the character described, a cutter plate having a slot therethrough, a

the cutter plate, a carriage mounted to reciprocate in a right line, a cutter blade mounted thereon, spring means engaging the carriage for slidably holding its cutter blade with an upward pressure against the under side of the cutter plate, an oscillating cutter shaft, a crank pin on the shaft, and a swing ing hook carried by the carriage for operatively connecting the shaft to the carriage.

2. In a machine of the character described, a cutter plate having a shallow top groove, a deep bottom groove and an intermediate slot, a fixed cutter blade adjustably positioned in said shallow top groove, a movable cutter blade mounted to reciprocate in said deep bottom groove, means for reciprocating the movable cutter blade, and a pair of coacting releasable spring fingers exerting an upward pressure on the movable cutter blade.

3. In a machine of the character described, a cutter plate having a shallow top groove, a deep bottom groove and an intermediate slot, a fixed cutter blade adjustably positioned in said shallow top groove, a movable cutter blade mounted to reciprocate in said deep bottom groove, an oscillating shaft operatively connected to the movable cutter blade to reciprocate it, and a pair of coacting' releasable spring fingers exerting an upward pressure on the movable cutter blade.

4. In a machine of the character described, a cutter plate having a shallow top groove, a deep bottom groove and an intermediate slot, a fixed cutter blade adjustably positioned in said shallow top groove, a carriage mounted to reciprocate in a right line in said deep bottom groove, a cutter blade mounted on said carriage, and means for reciprocating the carriage and thereby its cutter blade.

5. In a machine of the character described, a cutter plate having a shallow top groove, a deep bottom groove and an intermediate slot, a fixed cutter blade adjustably positioned in said shallow top groove, a carriage mounted to reciprocate in a right line in said deep bottom groove, a cutter blade mounted on said carriage, and an oscillating shaft operatively connected to the carriage to reciprocate it and thereby thecutter blade.

6. In a machine of the character described, a. cutter plate having a shallow top grcove, a deep bottom groove and an intern'iediate slot, a fixed cutter blade adjustably positioned in said shallow top groove, a carriage mounted to reciprocate in a right line in said deep bottom roove, cutter blade mounted on said carriage, means for reciprocating the carriage and thereby its cutter blade, and spring means serving the double purpose of holding the carriage in its groove and exerting an upward pressure on th carriage and thereby the movable cutter blade.

7. In a machine of the character described, a cutter plate having a shallow top groove, a deep bottom groove and an intermediate slot,

and thereby the cutter blade, and spring means serving the double purpose of holding the carriage in its groove and exerting an upward pressure on the carriage and thereby the movable cutter blade.

8. In a machine of the character described, a cutter plate having a shallow top groove, a deep bottom groove and an intermediate slot, a fixed cutter blade adjustably positioned in said shallow top groove, a carriage mounted to reciprocate in said deep bottom groove, a cutter blade mounted on said carriage, means for reciprocating the carriage and thereby its cutter blade, and a pair of coacting releasable spring fingers serving the double purpose of holding the carriage in its groove and exerting an upward pressure on the carriage and thereby the movable cutter blade.

9. In a machine of the character described a cutter plate having a shallow top groove, a deep bottom groove and an intermediate slot, a fixed cutter blade adjustably positioned in said shallow top groove, a carriage mounted to reciprocate in said deep bottom groove, a

cutter blade mounted on said carriage, an oscillating shaft operatively connected to the carriage to reciprocate it and thereby the cutter blade, and a pair of coacting releasable spring fingers serving the double purpose of holding the carriage in its groove and exerting an upward pressure on the carriage and thereby the movable cutter blade.

10. In a machine of the character described, a cutter plate having a. shallow top groove, a deep bottom groove and an intermediate slot, a fixed cutter blade adjustablyv positioned in said shallow top groove, a carriage mounted to reciprocate in a right line in said deep bottom groove, a cutter plate mounted on said carriage, a shaft having a crank pin, and a vertically swinging hook carried by the carriage and removably engaged by sai a crank pin whereby the carriage is reciprocated by the shaft.

11. In a machine of the character described, a cutter plate having a shallow top groove, a deep bottom groove and an intermediate slot, a fixed cutter blade adjustably positioned in said shallow top groove, a carriage mounted to reciprocate in said deep bottom groove, a cutter plate mounted on said carriage, a shaft having a crank pin, a vertically swin ing hook carried by the carriage and removably engaged by said crank pin whereby the carriage is reciprocated by the shaft, and a spring carried by the carriage in position to prevent the hook from being unintentionally released from its crank pm.

.' in the second named slot in the cutter plate.

1 2. In *a machine 1 of the character described, a cutter plate having a slot therethrough anda deep bottom groove extending therefrom, a fixed cutter blade mounted on the cutter plate, a carriage mounted to reciprocate in said deep bottom groove and having longitudinal side grooves, a cutter blade mounted on the carriage, a pair of laterally movable spring fingers mounted on the bottom of the cutter plate in position to swing into said grooves to serve the double purpose of holding the carriage in its deep bottom groove and exert an upward pressure on the carriage and thereby its cutter blade, and means for reciprocating the carriage and thereby its cutter blade. 7

-' 13. In a machine of the character described, a cutter plate having a slot there through and a deep bottom groove extending therefrom, a fixed. cutter blade mounted on the cutter plate, a carriage mounted to reciprocate in said deepbottom groove and having longitudinal side grooves, a cutter blade mounted on the carriage, a pair of laterally movable spring fingers mounted on the bottom of the cutter plate in position to swing into said grooves to serve the double purpose of holding the carriage in its deep 7 bottom groove and exert an upward pressure on the carriage and thereby its cutter blade, and an oscillating shaft operatively connected to the-carriage to reciprocate it and thereby the. cutter blade.

14. In a machine of the character described, a cutter plate having. a slot therethrough, a deep bottom groove extending rearwardly therefrom and a second slot opening through the top of the cutter plate from said deep bottom groove, a fixed cutter blade mounted on the cutter plate, a movable cutter blade, a carriage therefor mounted to reciprocate in a right line in said'groove, means for reciproe eating the carriage and thereby its cutter blade, and means whereby the cutter blade may be adjustably mounted on the carriage, said means ccmprising a slot in the blade and a clamp screw passing through the slot into threaded engagement with the carriage, the head of said screw being fitted to reciprocate 15. In a machine of the character described, a cutter plate having a slot therethrough, a deep bottom groove extending rearwardly therefrom and a second slot opening through the top of the cutter plate from said deep bottom groove, a fixed cutter blade mounted on the cutter plate, a movable cutter plate, a carriage therefor mounted to reciprocate in said groove, means for'reciprocating the carriage and thereby its cutter blade, means whereby the cutter blade may be adjustably mounted on the carriage, said'means comprising a slot in the blade and a clamp screw passing through the slot into threaded engagement with the carriage, the head of said screw being fitted to reciprocate in the second named slot in the cutter plate, and releasable spring meansserving the double purpose of removably holding the carriage in its groove and exerting an upward pressure on the carriage to cause the movable cutter blade to frictionally engage the fixed cutter blade when coacting therewith.

16. In a machine of the character described, a cutter plate having a slot therethrough, a deep bottom groove extending rearwardly therefrom and a second slot opening through the top of the cutter plate from said deep bottom groove, a fixed cutter blade mounted on the cutter plate, a. movable cutter blade, a carriage therefor mounted to reciprocate in said groove, means for reciprocating the carriage and thereby its cutter blade, means whereby the cutter blade may be adjustably mounted on the carriage, said means comprising a slot in the blade and a clamp screw passing through the slot into threaded engagement with the carriage, the head of said screw being fitted to reciprocate in the second named slot in the cutter plate, and releasable spring means serving the double purpose of removably holding the carriage in its groove and exerting an upward pressure on the carriage to cause the movable cutter blade to frictionally engage the fixed cutter blade when coacting therewith, said movable cutter blade having a forwardly projecting prong at all times'in engagement with the under side of the fixed cutter blade.

17. In a machine of the character described, a cutter plate having a slottherethrough, a deep bottom groove extending rearwardly therefrom and a secondslot opening throughthe top of the cutter plate from said deep bottom groove, a fixed cutter blade mounted on the cutter plate, a movable cutter blade, a carriage therefor mounted to reciprocate in a rightline in said groove, means whereby the cutter blade may be adjustably mounted on the carriage, said means comprising a slot in the blade and a clamp screw passing through the slot into threaded engagement. with the carriage,- the head of said screw being fitted to reciprocate in the second named slot in the cutter plate, and an oscillating shaft operatively connected to said carriage. a

In testimony, that I claim the foregoing as my invention, I have signed my name this 28th day ofMarch 1931.

EMIL PRAZAK.-. 

